How do I read thru a SQL database table using a loop and insert those records into a datagridview

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C#

// Define the Variables for Connection to the SQL Server

            String ConnectionString2 = @"Data Source = hemsql02;Initial Catalog=OTITest;User ID=wgtest;Password=Testit$1";
            SqlConnection conn = new SqlConnection(ConnectionString2);
            con.Open();   // Open up the path to the Database.....

            // Setup Sql Statement for Selection of Records......
            String SqlSelectRecords = ("select g.[Year] ,g.[EffectiveDate],g.[Volume] ,g.[Currency] ,g.[RateType] ,g.[MinimumRate] ,i.[State], i.[Location], i.[IndexEffective], i.[Page], i.[PageDescription] FROM[MultiYearWageGuide]as g join[MultiYearWageIndex] as i ON g.Volume= i.Volume AND g.Page = i.Page AND g.LocCode = i.Location WHERE store= " + int.Parse(textBox2.Text));
                        
            // Assign the variable cmd the value of the selection with the connection.......
            SqlCommand cmd = new SqlCommand(SqlSelectRecords, con);

            // Assign the DataReader to a variable......
            SqlDataReader sqldr = cmd.ExecuteReader();


            // Keep reading thru the file for values from the selection and move them to the appropriate area of the Form .....                          
              if (sqldr.Read())       
              {
                
                    // Load the DataGrid Table1 with Values from DataBase Table ......

                    dataGridView1.Rows.Add(YearVal, EffDateVal, VolumeVal, CurrVal, RateTypeVal, MinRateVal);

                    // Load the DataGrid Table2 with Values from Database Table.....

                    //dataGridView2.Rows.Add(YearVal, EffDateVal, VolumeVal, CurrVal, RateTypeVal, MinRateVal);

What I have tried:

I have tried everything but dont know enough C# to do this

Posted 7-Nov-19 7:12am

Debashis3850

Updated 6-Sep-21 0:54am

Maciej Los

v2

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Richard MacCutchan · Answer 1 · 2019-11-07T07:37:00

Use a DataAdapter and DataSet that binds to the DataGridView. See Populating a DataSet from a DataAdapter | Microsoft Docs[^].

[edit]
Alternatively just a simple while loop:

C#

while (sqldr.Read())       
{
    // Load the DataGrid Table1 with Values from DataBase Table ......
    // use the reader.GetXXX methods to find the different values
    // or index to each field - see below
    DatadataGridView1.Rows.Add( insert values here ...);
}

SqlDataReader.Item[Int32] Property (System.Data.SqlClient) | Microsoft Docs[^]

[/edit]

Maciej Los · Answer 2 · 2019-11-07T08:27:00

At the beginning...

First of all...

C#

String SqlSelectRecords = ("select g.[Year] ,g.[EffectiveDate],g.[Volume] ,g.[Currency] ,g.[RateType] ,g.[MinimumRate] ,i.[State], i.[Location], i.[IndexEffective], i.[Page], i.[PageDescription] FROM[MultiYearWageGuide]as g join[MultiYearWageIndex] as i ON g.Volume= i.Volume AND g.Page = i.Page AND g.LocCode = i.Location WHERE store= " + int.Parse(textBox2.Text));

Such of query is sql injection[^] vulnerable!
Do not use concatenated strings! Use parameterized queries[^] instead!

Second of all...
String is not the same as string! In a short:

Quote:
The string type represents a sequence of zero or more Unicode characters. string is an alias for System.String in .NET.

FOr further details, please see:
String Class (System) | Microsoft Docs[^]
string[^]

As to your question...
I have no idea why do you want to use loop! Use DataSet, DataAdapter as Richard MacCutchan mentioned. You can use a DataTable[^] too.

Tip: use using statement[^] to easily manage disposable objects. For example:

C#

//first
dataGridView1.AutoGenerateColumns = true;

//then
DataTable dt = new DataTable();
string sCs = "...";
string sCommand = "SELECT ... WHERE store = @aStore";
using (SqlConnection connection = new SqlConnection(sCs))
    using(SqlCommand command = new SqlCommand(sCommand, connection))
    {
        connection.Open();
        command.Parameters.AddWithValue("@aStore", textBox2.Text)
        using(SqlDataReader reader = command.ExecuteReader())
            dt.Load(reader);
    }

//finally...
dataGridView1.DataSource = dt;

How do I read thru a SQL database table using a loop and insert those records into a datagridview

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